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Corinna Riginos
Corinna Riginos and Morgan Graham in Wyoming accidentally discovered a way to decrease the number of deer-related crashes. They found that covering wildlife warning reflectors with white cloth bags led to a 65 percent drop in the number of deer carcasses along that road.

SALT LAKE CITY — Two Wyoming researchers say they may have discovered a way to help prevent deer-related crashes on freeways. The method has the Utah Department of Transportation taking note.

Corinna Riginos and Morgan Graham tested wildlife warning reflectors on four Wyoming highways where car-deer collisions pose a serious and costly threat to highway safety.

"When we covered up the reflectors with a white canvas bag, basically because we just wanted to neutralize the reflectors, we found that the white canvas bag worked better than the reflectors," Riginos said.

They recorded a reduction in the number of dead deer and a change in deer behavior in those areas.

There were 65 percent fewer deer carcasses in the areas where they put a white cloth bag over the reflectors simply as a control for their test. The reflectors, however, were 32 percent more effective than the posts when they were covered with black bags, also part of the control.

"We certainly didn't expect to find something as simple as a white bag to be even more effective," said Riginos. In their findings, they "suggest that the white bags are more visible or reflective to deer than the red wildlife warning reflectors and are thus substantially more effective than reflectors."

"We don't know exactly why," Riginos said. "Obviously, it's really hard to get inside a deer's head and know exactly what they're thinking."

They theorize the white color might alert the deer, much in the way they alert each other by flipping their white tails in times of danger.

"I think it's something about the moving light, the brightness of it," she said. "Even where we were doing this, the deer ultimately did cross the road, when there were no cars. It just made them more aware of the vehicles and less likely to run into the road in front of a vehicle and get hit."

Steering clear of deer is a big problem in Utah, too.

"I think it's really interesting," said Brandon Weston, UDOT's director of environmental services. "It's good to see new innovations being tested."

He's eager to learn more about it.

"If it proves to be an effective solution, it's something we would definitely be interested in trying," he said.

UDOT tracks areas across the state where the most car-deer collisions occur. One of those areas is U.S. 40 between Park City and Heber City. UDOT built tall fencing along that stretch of highway that funnels the deer into underpasses and away from traffic. Farther down the road, an electrified mat alerts the deer to stay away.

"The main part of being able to do these things successfully is knowing where the deer are and where the deer are moving to,” Weston said.

Last year, more than 6,000 animals were killed on Utah roads — more than 5,500 mule deer and 150 elk. On average, a collision with a deer costs more than $2,500 to repair a vehicle. The costs soar with injuries to the driver or passengers.

If a white cloth bag on a pole works well, UDOT is willing to try it.

"We're going to continue working to find new ways to keep the roads safer," Weston said.

"It's not a perfect solution," said Riginos, who plans more research, “but it definitely suggests that we might be on to something good here."